I just tested it on vista 64-bit and for me it works fine.That unfortunately means that your windows isn't working properly.Please send us logs from HijackThis program, here are screenshots illustrating what we need: http://forum.allplayer.org/viewtopic.php?f=12&t=578

Send logs and a description about the problem to info@allplayer.org or register on our forum and attach to the post.